SQL SELECT查询

Question

我有3个表：

users: 

uid int(11) - userid(primary key, auto_increment) 
name varchar(255) 
pass varchar(64) 
created int(11) 

projects: 

pid int(11) ..... 
name varchar(150) 
description varchar(255) 
created int(11) 

users_projects: 

uid int(11) - user id 
pid int(11) - product id 

什么是查询：通过显示名称与特定名称的用户排序的项目（名称和说明）？

这是我到目前为止有：

SEECT name,description FROM projects ORDER BY name ASC 

Answer 1

SELECT a.*, b.* 
FROM users a 
     INNER JOIN users_projects b 
      ON a.uid = b.uid 
     INNER JOIN projects c 
      ON b.pid = c.pid 
ORDER BY a.Name ASC 

为了进一步获得更多的知识有关加入，请访问以下链接：

• Visual Representation of SQL Joins

Answer 2

看起来你只需要加入表格。这里@Name是一个参数，包含用户的名字，你想要项目的详细信息：

SELECT projects.Name, 
     projects.Description 
FROM projects 
     INNER JOIN users_projects 
     ON projects.pid = users_projects.pid 
     INNER JOIN Users 
     ON users_projects.UId = Users.UId 
WHERE Users.Name = @Name 
ORDER BY projects.Name ASC